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Schedule of Property, Plant And Equipment Estimated Lives (Detail)
12 Months Ended
Mar. 31, 2018
Minimum [Member] | Plants [Member]  
Property, Plant and Equipment [Line Items]  
Estimated lives of assets - (years) 20 years
Minimum [Member] | Buildings [Member]  
Property, Plant and Equipment [Line Items]  
Estimated lives of assets - (years) 20 years
Minimum [Member] | Machinery and Equipment [Member]  
Property, Plant and Equipment [Line Items]  
Estimated lives of assets - (years) 3 years
Maximum [Member] | Plants [Member]  
Property, Plant and Equipment [Line Items]  
Estimated lives of assets - (years) 30 years
Maximum [Member] | Buildings [Member]  
Property, Plant and Equipment [Line Items]  
Estimated lives of assets - (years) 40 years
Maximum [Member] | Machinery and Equipment [Member]  
Property, Plant and Equipment [Line Items]  
Estimated lives of assets - (years) 25 years